Quarterly report pursuant to Section 13 or 15(d)

Summary of Warrant Activity (Detail)

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Summary of Warrant Activity (Detail) (Warrants, USD $)
9 Months Ended
Sep. 30, 2014
Warrants
 
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Warrants outstanding at December 31, 2013 1,698,000
Granted 0
Exercised (200,000)
Forfeited, cancelled, or expired (610,000)
Warrants outstanding at September 30, 2014 888,000
Warrants exercisable at September 30, 2014 753,000
Vested warrants expired during the quarter ended September 30, 2014 0
Weighted Average Exercise Price  
Warrants outstanding at December 31, 2013 $ 5.44
Granted   
Exercised $ 2.00
Forfeited, cancelled, or expired $ 5.71
Warrants outstanding at September 30, 2014 $ 6.04
Warrants exercisable at September 30, 2014 $ 6.40
Vested warrants expired during the quarter ended September 30, 2014